Commercial examples Potassium permanganate-based scavengers:KMnO4 are available in sachets for packages or blankets for storage chambers--- not incorporated into food Immobilized in-- inert substrate such as alumina or silica gel-- 4 – 6%. The performance and useful life of the scavengers depend on the substrate surface area and the content in permanganate. Potassium permanganate oxidises ethylene to acetate and ethanol and in the process changes colour from purple to brown, and hence indicates its remaining ethylene scavenging capacity